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. 2019 Apr 23;91(10):6530–6540. doi: 10.1021/acs.analchem.8b05598

Figure 5.

Figure 5

Box plot of the preprocessed peak intensities of the 48 MS images belonging to the cross-validation set (A) and combined in the three main tissue types (B). A Kruskal–Wallis test resulted in a difference in the intensity distribution between the tissue types, at a significance level of 95%. After standardization (C, D), no significant difference was found between the peak intensities of the three tissue types.